shanthoosh commented on a change in pull request #1026: SAMZA-2189: Integrate
startpoint resolution workflow with SamzaContainer startup sequence.
URL: https://github.com/apache/samza/pull/1026#discussion_r283012902
##########
File path:
samza-core/src/main/scala/org/apache/samza/container/TaskInstance.scala
##########
@@ -141,15 +142,36 @@ class TaskInstance(
collector.register
}
- def registerConsumers {
+ /**
+ * Computes the starting offset for the partitions assigned to the task and
registers them with the underlying {@see SystemConsumers}.
+ *
+ * Starting offset for a partition of the task is computed in the following
manner:
+ *
+ * 1. If a startpoint exists for a task, system stream partition and it
resolves to a offset, then the resolved offset is used as the starting offset.
+ * 2. Else, the checkpointed offset for the system stream partition is used
as the starting offset.
+ */
+ def registerConsumers() {
debug("Registering consumers for taskName: %s" format taskName)
systemStreamPartitions.foreach(systemStreamPartition => {
- val startingOffset = getStartingOffset(systemStreamPartition)
- val startpoint = offsetManager.getStartpoint(taskName,
systemStreamPartition).getOrElse(null)
- consumerMultiplexer.register(systemStreamPartition, startingOffset,
startpoint)
- metrics.addOffsetGauge(systemStreamPartition, () =>
- offsetManager.getLastProcessedOffset(taskName,
systemStreamPartition).orNull
- )
+ var startingOffset: String = getStartingOffset(systemStreamPartition)
+ val startpoint: Option[Startpoint] =
offsetManager.getStartpoint(taskName, systemStreamPartition)
+ if (startpoint != null && startpoint.isDefined) {
Review comment:
Done.
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